(15) Therefore, it can be concluded that the sacrificial excipients could be useful to prevent devitrification
of an amorphous drug by decreasing the plasticizing effect of adsorbed water.
Earlier work has found that for this particular colloidal silica binder system, the silica devitrification
temperature was around 1,868F (1,020C) at a heat rate of 27F per minute.
Catauro, "Glass transition temperature and devitrification
behaviour of glasses in the Na2O x 4GeO2K2O-4GeO2 composition range," Materials Chemistry and Physics, vol.
Which effect will be dominant depends on whether devitrification
of the rigid amorphous chains takes place, during the allotted time.
from the relative oxides) which, these last ones, could act as nucleating centres for a partial devitrification
of the glass, as is known to occur in the multicomponent materials [38-41].
The secondary minerals nontronite and locally celadonite represent the first crystallised species lining the outer part of the cavities Other mineral phases occurring during the early stage were calcite and cryptocrystalline silica Nontronite was probably formed by basalt devitrification
due to hydration, although ferromagnesian mineral phases present in the basalts might have also contributed to its formation.
At a temperature higher than 157.2[degrees]C, the storage modulus began to decrease as the temperature increased because of the devitrification
of the adhesive.
Not only did the front surface show an appreciable diffusion due to devitrification
of the glass, but ...
Thus, for [Al.sub.85][Ni.sub.5][Y.sub.10] alloy nanocrystallized by controlled devitrification
have been noticed spectacular increases in hardness compared to the amorphous state (with 20-40%) and compared with best conventionally cast crystalline aluminium alloy and heat-treated later (200-300%) (Inoue et al., 2000).
The large range in U may be related to devitrification
and alteration of the rhyolite groundmass.